OIL AND GAS INFORMATION (Tables)

12 Months Ended

Dec. 31, 2015

OIL AND GAS INFORMATION

Schedule of costs related to the oil and gas activities incurred

	2015		2014
	(in thousands)
Property acquisition—unproved	$	—	$	184,410
Property acquisition—proved		18,626		172,264
Exploration costs		3		32
Development costs		17,359		108,676
	$	35,988	$	465,382

Schedule of aggregate capitalized costs relating to the Company's oil and gas activities

	2015		2014
	(in thousands)
Unproved oil and gas properties	$	14,658	$	204,627
Proved oil and gas properties		1,125,297		1,091,063
		1,139,955		1,295,690
Less accumulated depreciation, depletion, amortization and impairment expense		977,270		542,194
	$	162,685	$	753,496

Schedule of the Company's results of operations from oil and natural gas producing activities

	2015			2014
	(in thousands)
Revenues	$	83,734		$	145,385
Production costs		(49,557	)		(48,357	)
Accretion of asset retirement obligation		(2,857	)		(2,521	)
Impairment		(562,151	)		—
Depreciation, depletion, amortization		(59,729	)		(50,686	)
Income (loss) from oil and gas producing activities	$	(590,560	)	$	43,821

Summary of Warren's oil and gas properties not subject to amortization

	Costs incurred in
	Fiscal year 2015		Fiscal year 2014		Fiscal year 2013		Prior to 2013		Total
	(in thousands)
Acquisition costs	$	—	$	—	$	—	$	—	$	—
Exploration costs		—		—		—		—		—
Development costs(1)		365		1,127		126		13,040		14,658
Total oil and gas properties not subject to amortization	$	365	$	1,127	$	126	$	13,040	$	14,658

(1)           The Company's development costs primarily reflect investment in well cellars and facilities in its Wilmington oil field to facilitate the development of future oil wells. These costs will be allocated to future wells drilled, the majority of these wells are expected to be drilling during the next five to eight years.